Ok, and can the length be -7, as well? As in divide through by -7 to find the right answer? That is what my book says, so I just wanted to verify this.
Ok, and can the length be -7, as well? As in divide through by -7 to find the right answer? That is what my book says, so I just wanted to verify this.
Length is never negative.
However, dividing by $\displaystyle -7$ also gives a unit vector parallel to the given vector.